then, a discussion about genetically modified foods with new york university professor mary ann nestle. it will also look for your reaction, as always, by phone, e-mail, and twitter. live every day at 7:00 a.m. eastern on c-span. >> the white house has president obama and the first lady will go to south africa next week to pay their respects to the memory of the late nelson mandela. also on friday, former secretary of state hillary clinton talked about the former south african president's legacy. here is some of what she said. >> we meet on that day after the loss of a giant among us, someone who, by the power of his example, demonstrated that unequivocally how each of us can choose how we will respond to those in justice's and grievances, those sorrows and tragedy's that afflict all of humankind. nelson mandela will be remembered for many things. he will be, certainly, remembered, for no way he led his dignity, as extraordinary understanding , not just tough how to bring democracy and freedom to his beloved south africa, but how important it was that he first brought freedom to himsel